I was inspired to do this because of the new "GRGN-C: Water Warriors Gorgon "Commando" Minimization Mod" thread and the fact that my SS 200 is in pieces in my bedroom .

In pieces means that:
1) All the pipes are clogged up with some brown stuff
2) Trigger pipe is broken
3) Body work is broken
4) Pump is stuck in place

Fortunately for me the Reservoirs and PC where not broken .

I'm either going to use a new super soaker gun (for the looks) and add the pieces I have to it or use very hard to find plumbing bits (Where I am in the UK there aren't very many places around me to get parts from and i don't like shipping) to create it.

Neither option. If the gun is that broken, it's not worth repairing, and the reservoir and pc are nothing special considering that it's a 200. What I would do is save the shell, replace the tubing, the trigger, and the pump, and use the parts for asthetics if it all falls apart.